How long will Unicom take effect after completing the monthly traffic package, and will it send a text message to remind you?

It depends on whether you apply for a new card. If it is a new card, it can be opened 24 hours at the latest. If you use your previous Unicom number, that is, you haven't handled gprs before, then you won't be able to enjoy this package until next month, that is, you can't handle it this month. Unicom won't send you a short message. But you can call customer service to verify the inquiry, hoping to help you.